20538484641 has 12 divisors (see below), whose sum is σ = 29668384720. Its totient is φ = 13691545560.

The previous prime is 20538484619. The next prime is 20538484643. The reversal of 20538484641 is 14648483502.

20538484641 is a `hidden beast` number, since 205 + 384 + 8 + 4 + 64 + 1 = 666.

It is not a de Polignac number, because 20538484641 - 2¹¹ = 20538482593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20538484643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134886 + ... + 243456.

Almost surely, 2^20538484641 is an apocalyptic number.

It is an amenable number.

20538484641 is a deficient number, since it is larger than the sum of its proper divisors (9129900079).

20538484641 is a wasteful number, since it uses less digits than its factorization.

20538484641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129596 (or 129593 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 20538484641 in words is "twenty billion, five hundred thirty-eight million, four hundred eighty-four thousand, six hundred forty-one".